Blower or suction fan



7 July 24, 1923.

I c. A. KUENZEL, JR I BLOWER OR SUCTION FAN Filed JaI l. 24. 1922 i 3 Sheets-Sheet 1' aim:

ATTORNEYS Q C. A. KUENZEL. JR

BLOWER OR SUCTION FAN VENT 3,:

ATTORNEYS Jgufi 24, m3.- v 11%2557 v C. A. KUENZEL. JR

BLOWER OR SUCTION FAN Filed Jan; 24. 1922' 3 Sheets-Sheet 5 ATTORNEYS Patented July 2%, 1923.

CHARLES A. KUENZEL, JR., 031 BLOO'MFIELD, NEBRASKA.

BLOVVEB OR SUCTION FAN.

Application filed January 24, 1922. Serial No. 531,349.

To all whom it may concern:

Be it known that I, Crmntns A. Kenn- ZEL, Jr., a citizen of the United States, residing at Bloomfield, in the county of Knox, State of Nebraska, have invented a new and useful Blower or Suction Famof which the following is aspecification.

My invention consists of a novel construction of a blower or suction fan, the moving parts of which will be light, durable and effective under all conditions and will be adapted for the compression and propulsion of high and low pressures of air in proper volume or quantities for ventilation or other purposes, my novel device comprising a casconduit or fan housing having axial air intakes and a circumferential tangential outlet, whereby the air compressed and impelled by the fluid is conducted and dis charged effectively and in the proper direction to the desired point.

My invention further consists in a novel construction of fan blades having preferably straight inner and outer terminals and an intermediate bowed portion, the inner terminals being adapted to be secured to a novel construction of hub brackets, and the outer blade terminals being secured to a novel construction of outer ring carrying radial arm terminals, the inner and outer portions of the fan structure being rigidly and effectively braced by hollow radial arms, whereby a durable and elfective fan structure is produced.

It further consists of a novel construction of fan shaft carrying thereon hub brackets consisting of body portion having radial ribs facing or juxtaposed to each other, said radial ribs serving to secure the inner terminals of the fan blades in position, the outer terminals of said fan blades being se cured within annular rings.

It further consists of a novel construction of fan shaft having hub brackets, outer rings to which radial arm brackets are secured, hollow radial arms common to said brackets, and fan blades common to said ring and hub brackets, in conjunction with auxiliary suction fans located on the outer portions of the fan shaft.

It. further consists of other novel features of construction, all as will be hereafter fully set forth.

For the purpose of illustrating'my invention, I have shown in the accompanying drawings, one form thereof which is at present preferred by me, since the same will give in practice satisfactory and reliable results. it is to be understood, however, that the various instrumentalities of which my invention consists may be variously arranged and organized and that my inven tion is not limited to the precise arrange ment and organization of these instrumentalities as herein shown and described.

Figure 1 represents a side elevation of a blower or suction fan embodying my invention, the fan blades being omitted for the sake of clearness of illustration.

Figure 2 represents a section on line 22 Figure 1.

Figure 3 represents a section on line 3-3 Figure 2.

Figure 4: represents a side elevation of the right-hand hub bracket and radial arm bracket seen in Figure 2 in detached position.

Figure 5 represents a plan view of Figure 4.

Figure 6 represents a side elevation of one of the fan blades constructed substantially as seen in Figures 2 and 8.

Figures 7, 8, 9 and 10 represent side elevations of other forms of fan blades.

Figures 11 and 12 represent vertical, sectional views of modifications.

Similar numerals of reference indicate corresponding parts.

Referring to the drawings:

1 designates my novel construction of fan, the same comprising the casing, conduit or housing, composed of the outer wall 2, and the sides 3 in which are located the conical intake openings l, whose walls converge inwardly, the outlet or exit opening of the fan casing being indicated at o. The fan shaft 6 has the pulley 7 thereon, to which power may be applied by a belt or other means, said shaft rotating in the bearings 8, which may be provided with suitable lubricating devices.

In proximity to the bearings 8, I locate the hubs 9 of the suction fans 10, which are located just inside of the intakes and whose blades are of such curvature and contour that they serve initially to create a suction and direct the incoming air currents towards the large pressure blades 11, whose contour in cross-section may be as seen in Figures 2 and 3 or 6 to 10.

The inner terminal 12 of each fan blade may be secured to the fan shaft 6 and to the ribs 13 of the fan hub and radial arm bracket 141 best seen in Figures 4 and 5, said bracket comprising the plate or body 15 having said ribs thereon and the hole 16 therethro-ugh, through which the shaft 6 passes. There are two of the brackets 15 and they are assembled on the fan shaft 6 with the radial ribs 13 facing each other, so that the inner terminals 12 of the fan blades are secured in a rigid and effective manner.

The hub brackets 15 have the inner ends 17 of the hollow radial arms 16 secured thereto, said arms being preferably three in number and being preferably hollow for purposes of lightness and strength. The outer ends 18 of the radial arms 16 are secured to the inner ends of the outer radial arm brackets 19, the upper portion of the latter being secured to the inner surface of the ring 20, to which the outer terminal 21 of the fan-blade is secured.

It will be evident from Figure 2 that there are two sets of the hollow radial arms 16 and their adjuncts, and the various elements, as the hub brackets 15, arms 16, outer brackets 19, rings 20 and outer blade terminals 21 may be brazed, welded or otherwise assembled and rotate as a unit with the shaft 6 and suction fans 10, so that a very light, durable and eflicient fan structure is produced which is capable of being rotated at high speeds, if desired, without liability of injuring or loosening of any of the parts.

The fan blades 11 are cut out at their sides or provided with concave edges, 22, as seen in Figure 2, and are of such contour and dimensions that the incoming air which is initially acted! on by the suction fans, is compressed and impelled into and through the conical intake openings 1 at a high velocity and at a. regular and even speed, and thereafter is further compressed and effectively impelled through the exit 5 to the desired point.

The various forms of fan blades 23, 24, 25 and 526 seen in Figures 7 to 10 may be em ployed to suit different ventilating problems and conditions, as is evident.

The operation is as follows As the fan shaft 6 is rotated, it will be apparent that the air will be initially impelled towards the interior of the fan casing by reason of the suction fans 10, the air or other fluid being operated on being taken in axially through the intakes 4. As the fan shaft and blades 1.1 rotate, the air will be compressed, impelled and discharged circun'iferentially and tangentially through the exit 5 to the desired point, it being apparent that the whirling fluid discharged from the fan blades will escape circumferentially and: tangentially outward therefrom, so that there will be no diminution of efiiciency.

While I have described my invention as being especially adapted for ventilation purposes and to be used in connection with atmospheric air, it will be apparent that the same is adapted to be used in connection with the compression and inipelling of any other form of gas or fluid. Any one of the special shape of fan blades seen in Fig ures 7 to 10 may be employed! in connection with my invention to meet the different ventilating problems which may arise, said blade construction serving to compress and impel the air in the proper direction in an eilicient manner, as is evident, these blades being assisted in their work by the suction fans 10 carried by the same shaft, which, as is evident, cause the air to enter the fan at the intake openings at a higher velocity than would be possible said suction fans were omitted.

My novel type of blade suspension best seenin Figures 2 and 3 effectively supports the outer and the inner ends of the large pressure blades 11, which are held firmly by the special fan hubs, the outer rings, the radial arm brackets and the radial arms common thereto, as is evident.

In Figure 11, I have shown a slightly modified constructionof the fan 27, wherein 6 designates the fan shaft, as before, 20 the outer rings, 19 the radial arm brackets and 16 the radial arms, all of these elements being constructed as already described.

The hub bracket 28 however seen in Figure 11, is preferably made solid or in one piece, and is provided with four lugs or projections 29 to which the inner ends of the radial arms are secured, said solid hub bracket 28 being welded, brazed, pinned, shrunk or otherwise secured upon the fan shaft 6, and the radial arms 16 diverging outwardly therefrom.

. The fan blades 29* have their end portions secured to the rings 20 and! are provided with the concave or inwardly converging walls 30, which. are joined by the wall 31, it being apparent that said fan blades in the construction seen in F igure 11 donotextend inwardly so as to be connected to the hub bracket 28.

The fan construction 35 seen in Figure 12 is similar to the construction seen in Figure 11, except that the fan blades which I have indicated as 32 are provided: with the paralel outer and inner walls 33and 3 1, the ends of said blades 32 being secured to the rings 20 in any suitable manner.

The construction of the hub bracket 28, the radial arms 16 and the radial arm brackets 19 seen in Figure 12 is the same as already described, with respect to Figure 11,

and it will be apparent that in both the forms seen in Figures 11 and, 12, a very stiff, rigid, durable and effective fan structure is produced.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1,111 a device of the character stated, a rotary fan, comprising a fan shaft, hub brackets secured to said shaft, each of said brackets being provided with radial ribs juxtaposed to and facing each other, fan blades having their inner terminals secured to said shaft and to said ribs, outer rings'to which the outer terminal edges of said fan blades are secured, outer radial arm brackets secured to said rings, and radial arms having their inner and outer ends secured to said hub brackets and outer brackets respectively.

2. In a device of the character stated, a rotary fan comprising a fan shaft, a pair of hub bracket-s on said shaft, each being provided with radial ribs juxtaposed to and facing each other, fanblades having their inner terminals secured to said ribs, outer rings to which the outer terminal ec ges of said blades are secured, outer radial arm brackets secured to the inner surface of said rings, radial arms having their inner and outer ends secured to said hub brackets and outer brackets respectively, and suction fans secured to the outer portions of said fan shaft and revolving in unison therewith.

3. In a device of the character stated, a rotary fan comprising a fan shaft, a pair of hub brackets on said shaft, each being provided with radial. ribs juxtaposed to and facing aeh other, fan blades having their inner terminals secured to said shaft and to said ribs, outer rings to which the outer terminal edges of said blades are secured, outer radial arm brackets secured to said ring, hollow radial arms having their inner and outer ends secured to said hub brackets and outer brackets respectively, suction fans secured to the outer portions of said fan shaft and revolving in unison therewith, and axial intake openings having inwardly converging Walls.

4. In a device of the character stated, a fan casing having axial intake openings, and a circumferential, tangential outlet opening, a fan shaft mounted on suitable bearings, hub brackets secured to said shaft and having radial ribs juxtaposed to and facing each other and spaced apart a distance equal to the Width of the inner terminals of the distance equal to the width or fan blades, outer rings oppositely arranged, outer radial arm brackets secured to said outer rings, a plurality of radial arms common to said hub brackets and to said outer brackets, and fan blades having straight inner and outer terminals and intermediate curved portions, said inner terminals being secured to said fan shaft and to the ribs of said hub brackets, and-said outer terminals being secured to said outer rings.

5. In a device of the character stated, a fan casing having axial intake openings, and a circumferential tangential outlet opening, a fan shaft mounted on suitable bearings, suction fans mounted on the outer ends of said fan shaft, hub brackets secured to said shaft and having radial ribs juxtaposed to and facing each other and spaced apart a the inner terminalsof the fan blades, outer rings oppositely arranged, outer radial arm brackets secured to said outer rings, a plurality of radial arms common to said hub brackets and to said outer brackets, and fan blades having straight inner and outer terminals and intermediate curved portions, said inner terminals being secured to said fan shaft and to the ribs of said hub brackets, and said outer tenninals being secured to said outer rings.

6. In a device of the character stated, a fan casing having axial intake openings provided with inwardly converging walls and a circumferential, tangential outlet opening, a fan shaft mounted on suitable bearings, suction fans mounted on the outer ends of said fan shaft, hub brackets secured to said shaft and having radial ribsjuxtaposed to and facing each other, outer rings oppositely arran god, outer radial arm brackets secured to said outer rings, a plurality of hollow radial arms converging inwardly and secured to said hub brackets and said outer brackets, and fan blades having straight inner and outer terminals and intermediate curved portions, said inner terminals being secured to said fan shaft and to the ribs of said hub brackets, and said outer terminals being se curedto said outer rings.

CHARLES A. KUENZEL, JR.

Witnesses Aenns Dumas, E. LEAH FARLEY. 

